diff --git a/tox.ini b/tox.ini
index 9ab095f..8ce744e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,28 +1,21 @@
 [tox]
 minversion = 2.0
-envlist = docs,docs-constraints
+envlist = docs
 skipsdist = True
 
 [testenv]
 usedevelop = True
 install_command =
-                  constraints: {[testenv:common-constraints]install_command}
                   pip install -U {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 commands = python setup.py test --slowest --testr-args='{posargs}'
 
-[testenv:common-constraints]
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
-
 [testenv:docs]
 commands = python setup.py build_sphinx
 
-[testenv:docs-constraints]
-install_command = {[testenv:common-constraints]install_command}
-commands = python setup.py build_sphinx
-
+[flake8]
 show-source = True
 ignore = E123,E125
 builtins = _